| 摘要 |
PROBLEM TO BE SOLVED: To provide a latent heat recovery type water heater effectively utilizing weak heat from a secondary heat exchanger.SOLUTION: A drain discharging port 27 is formed near one side of a bottom part of a box-like casing 24, a combustion gas flowing inlet 28 is formed at an opposite side bottom part of the drain discharging port 27, an upper central part of the casing 24 is provided with a combustion gas discharging port 23 and further a plurality of heat absorbing pipes 22 are closely arranged within the casing 24 and a secondary heat exchanger 21 for recovering latent heat from combustion gas after passing through a primary heat exchanger 18 is housed. An air supplying passage 38a through which the surrounding atmosphere sucked under driving an air supplying fan 13 passes is arranged near the casing 24 and at the same time, an air passage 38b is spaced apart from the primary heat exchanger and surrounding air not heated too much is supplied as combustion air to a burner part 8. |
